However, in order to get Open-Shell to use a Windows 10 Start button icon, you need to enable the classic taskbar in the Registry.
If you've installed Start11 or StartAllBack, the programs will automatically enhance your taskbar with some options so we recommend that you skip this section. Another possibility is to uncheck Replace Start Button in Open-Shell's options menu and use the classic taskbar hack (see below) and then you'll get a clickable, Windows 10-style Start button.